Lincoln Electric IM756-A manual Cleaning the GUN Liner, Cleaning Components AS Required

D-2 MAINTENANCE D-2

CLEANING THE GUN LINER

•Unplug the machine or turn the power switch to the OFF - “0” position.

•Remove the gas nozzle and contact tip from the gun.

•Clean the inside diameter with a short piece of wire.

•Clean the cable liner when rough and erratic wire feeding occur:

Lay the cable out straight. Blow out gently with dry compressed air (max 145 psi) through the wire guide tube and check the condition of the tube. Bend the cable back and forth, then blow the tube out again. Repeat until clean.

CAUTION

Excessive pressure at start may cause the dirt to form a plug.

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CLEANING COMPONENTS AS REQUIRED

•	Unplug the machine or turn the power switch to the
	OFF - “0” position.
•	Blow dirt out of the welder with low pressure air to
	eliminate excessive dirt and dust buildup that could
	cause the welder to run hot.
•	Vacuum accumulated dirt from the gear-box and

COMPONENT REPLACEMENT

PROCEDURES

FIGURE D.1 – CONTACT TIP REPLACEMENT

CONTACT

TIP

0	L
.04
0 A
-
.1

NOZZLE

CHANGING THE CONTACT TIP

1.Refer to Figure D.1. Remove the gas nozzle from the gun by unscrewing it counter-clockwise.

2.Remove the existing contact tip from the gun by unscrewing it counter-clockwise.

3.Insert and tighten the desired contact tip. Do not overtighten.

4.Replace the gas nozzle.

CHANGING THE DRIVE ROLL

FIGURE D.2 – DRIVE ROLL REPLACEMENT

wire feed section.

• Inspect the incoming guide tube and clean the

inside diameter if necessary. Replace when exces-

sively worn.

• Replace Contact Tip - when the hole is enlarged or

elongated. (Refer to Changing The Contact Tip, in

this section.)

• Check the condition of the wire feed rollers.

Remove any metallic dust deposited in the feed

WIRE

INCOMING GUIDE TUBE

WIRE FEED

LOWER DRIVE ROLL

AND THUMB SCREW

SPRING LOADED HANDLE SCREW

UPPER

IDLER ROLL ARM

area (rollers and entrance and outlet wire guide).

• Check the gas hose and fittings for tightness.

The machine Wire Feed Drive Roll has two grooves; one for 0.023” - 0.025” (0.6 mm) solid steel electrode and the other for 0.030” (0.8 mm) solid and 0.035” (0.9 mm) flux-cored steel electrode. See Figure D.2. Use the appropriate sized groove for the wire used (as indicated by the stenciling on the side of the drive roll). Reverse the drive roll as follows.

Refer to Figure D.2.

1.Make certain the machine power switch is OFF - “0”.

2.Open the spring loaded pressure arm. Lift up the idle roll arm.

HANDY MIG